Explosive Actuated Tools Flashcards
What is a power load?
A power load is a loaded cartridge used in an explosive actuated tool.
What caliber are power loads available in?
.22
.25
.27
Low velocity tools use _____ power loads?
Crimp ended
What are the 6 colours and load velocity’s?
1-grey (91 MPs)(300 fps) 2-brown (119 mps) (380fps) 3-green (146 mps/480fps) 4-yellow (174mps/570fps) 5-red(201mps/660fps) 6-purple(229mps/750fps)
+90 Feet per second
+28 meters per second
A piece of hardware that mechanically joins two or more objects together is?
Fastener
Three common types of fasteners?
Drive pins-pin material directly to object
Threaded studs-shank imbedded into material and object can be stretched to threaded material.
Drive pin assemblies-conduit clip, top hat, ceiling clip
Over 4.83mm or 3/16 type fastener?
Heavy duty
Under 4.83mm or 3/16 is what type fastener?
Light duty
What are applied loads
Tension load - force of fastener perpendicular to the base material
Shear load - force to the fastener perpendicular to the fastener
Bending load - force applied at a distance from the surface to the base material
What characteristics make a good base material?
Resilience to expand and compress when pierced
Sufficient hardness to produce holding power
Sufficient thickness to produce holding power, but not allow fastener to fully pass through.
What are characteristics of unsuitable base materials?
How brittle they are:
Glass
Glazed tile
Brick
How soft they are: Wood Plaster Drywall Composition board Plywood
What is the centre punch procedure?
A test to determine if the base material is suitable.
Take a fastener, hit the fastener with a single average straight hammer blow.
Makes nice dent - continue to gun set up
Blunts fastener end- to hard
Cracks the material - to brittle
Sinks into material - to soft
Suitable concrete base materials?
Poured concrete(suitable thickness) Pre cast concrete(engineer’s approval) Pre stressed concrete(engineer’s approval) Concrete block(web only) Brick (horizontal joints only)
What is load strength?
Ability of fastener to withstand tension and shear force.
What factors influence load strength?
Fastener shank diameter and depth of penetration
Density and strength of the base material
Masonry/concrete spall
Hardness and concentration of aggregate
Fastener spacing and edge distance
Load strength adjustments
What is a properly set fastener in concrete?
The fastener penetrates the concrete 6 to 8 times the diameter of the shank but only penetrates the base material to a depth equal to 1/3 the total thickness.
Proper nail size= proper embedment-thickness of material.
Proper embedment 1 1/8 to 1 1/2
Base material cracks
Fasteners set to close to edge
Fasteners set to close together
Improperly cured concrete
Far side of base material breaks away
Base material to thin
To long of fastener
Reduce spalling by:
Use fastener with smaller shank
Try longer shank length or lesson the power load
Hold tool perpendicular
Mount a stop spall adapter
Drive fastener through a approved steel disc
What is proper fastener spacing for concrete?
3 inches from edge and 3 inches from each other.
In order to get maximum holding power in steel, what is the ideal penetration through the base?
1/4” or 6mm
What is the correct fastener spacing for steel?
1/2” from edge
2” from each other
2” from welds or other major heating
What are the firing procedures?
Select proper fastener Select proper accessories if needed Select the power load Load the tool Fire the tool
What dictates type of fastener?
Thickness of hardness of a material
Type and thickness of material being applied
Intended use of application
What do you do if the gun misfires
Wait 30 seconds once the gun misfires and shoot again.
If the cartridge fails a second time wait 30
Seconds and remove cartridge and place in container of water
Properly dispose of.
Where are explosive actuated guns kept?
Locked in a container
Why must proper ventilation be used during operation of explosive actuated tool?
To prevent the injection of lead
